Filter a number of javascript objects using an array of values for one key

Question

I want to filter the following objects by category_id using the following array of category_id values:

[19012000, 19012001, 19012002, 19012003, 19012004, 190         


        

Answer 1

I don't see any reason to use _.first here? The rest of your filter statement looks good, altough you may swap the indexOf call for _.contains:

var postDates = _.filter(goodDates, function(n){
    return _.contains(category_id, n.category_id);
});